Next, you need to clean the hole of the hole and the area around it from fat oil pollution, old paint, crumbling plaster and other inclusions that will prevent the clutch of the water plug and concrete surface of the wall.
Next, you need to clean the hole of the hole and the area around it from fat oil pollution, old paint, crumbling plaster and other inclusions that will prevent the clutch of the water plug and concrete surface of the wall.